const md5 = require('md5');

function txAiSign(params, appkey){
    let str = ''
    params = ksort(params) 
 	for (let i in params){
 		if (params[i] !== ''){
 			str = `${str}${i}=${encodeURI(params[i])}&`
 		}
 	}
	str = str + "app_key=" + appkey
	let sign = md5(str).toUpperCase()
	return sign
}

function ksort(inputArr, sort_flags) {
  var tmp_arr = {},
    keys = [],
    sorter, i, k, that = this,
    strictForIn = false,
    populateArr = {};

  switch (sort_flags) {
  case 'SORT_STRING':
    // compare items as strings
    sorter = function (a, b) {
      return that.strnatcmp(a, b);
    };
    break;
  case 'SORT_LOCALE_STRING':
    var loc = this.i18n_loc_get_default();
    sorter = this.php_js.i18nLocales[loc].sorting;
    break;
  case 'SORT_NUMERIC':
    sorter = function (a, b) {
      return ((a + 0) - (b + 0));
    };
    break;
  default:
    sorter = function (a, b) {
      var aFloat = parseFloat(a),
        bFloat = parseFloat(b),
        aNumeric = aFloat + '' === a,
        bNumeric = bFloat + '' === b;
      if (aNumeric && bNumeric) {
        return aFloat > bFloat ? 1 : aFloat < bFloat ? -1 : 0;
      } else if (aNumeric && !bNumeric) {
        return 1;
      } else if (!aNumeric && bNumeric) {
        return -1;
      }
      return a > b ? 1 : a < b ? -1 : 0;
    };
    break;
  }

  for (k in inputArr) {
    if (inputArr.hasOwnProperty(k)) {
      keys.push(k);
    }
  }
  keys.sort(sorter);

  this.php_js = this.php_js || {};
  this.php_js.ini = this.php_js.ini || {};

  strictForIn = this.php_js.ini['phpjs.strictForIn'] && this.php_js.ini['phpjs.strictForIn'].local_value && this.php_js
    .ini['phpjs.strictForIn'].local_value !== 'off';
  populateArr = strictForIn ? inputArr : populateArr;

  for (i = 0; i < keys.length; i++) {
    k = keys[i];
    tmp_arr[k] = inputArr[k];
    if (strictForIn) {
      delete inputArr[k];
    }
  }
  for (i in tmp_arr) {
    if (tmp_arr.hasOwnProperty(i)) {
      populateArr[i] = tmp_arr[i];
    }
  }

  return strictForIn || populateArr;
}
module.exports = txAiSign;